INIT: ignite testnet Command

[julienrbrt]

Ignite testnet is an alternative to ignite chain serve (command that re-build and runs a single node chain).
That command should be used when in development (next to ignite chain simulate), but when willing to perform more realistic tests (with devnets/testnets) users should use the ignite testnet command:

ignite testnet:

• multi-nodes

  • start multiple nodes (pick how many, default 4)
  • be able to kill a node
  • interactive ui possibly using https://github.com/charmbracelet/bubbletea
  • be able to see logs of nodes directly from the ui

• in-place

  • INIT: In-Place Testnet Creation #4244

• interchaintest

  • https://github.com/strangelove-ventures/interchaintest/tree/main/local-interchain
  • https://github.com/strangelove-ventures/interchaintest/blob/main/docs/buildBinary.md